But for exasperated Jets fans, the irony and indignity of Mark Sanchez succeeding in Philadelphia is staring every one of you in the face with the power of halogen high-beam headlights from on oncoming car on a dark night.

This is what it has come to for the Jets: Not only is their season officially in the toilet at 1-8 after Sunday’s 24-10 loss to the Chiefs in Kansas City, but their former quarterback — who was run out of town as if he’d stolen lunch money from the children of every season-ticket holder — looks poised to possibly lead his new team to an NFC East title.

There is a catch phrase for that: Insult added to injury.

Sure, it was only one game — Sanchez coming in for injured Eagles starter Nick Foles on Sunday in Houston and completing 15 of 22 passes for 202 yards, two touchdowns and two interceptions in Philadelphia’s sixth win in eight games this season.

But with Foles likely out for at least four to six weeks with what has been reported as a fractured collarbone, the first-place Eagles are Sanchez’s team now.

And every good thing Sanchez does from here on will be a cold slap in the face of the Jets, who screwed him up in the first place on a number of levels — the worst of which was putting him into the game behind a band of backup offensive linemen late in that 2013 preseason game against the Giants.

The gushing about Sanchez coming out of Philadelphia in the aftermath of the Eagles’ 31-21 win over the Texans must gall Jets fans, most of whom were more certain he couldn’t play at all than they are that current general manager John Idzik is a poor talent evaluator.

By the time Sanchez was let go after last season, all Jets fans seemed to want to associate him with was the infamous “butt-fumble,’’ which wasn’t even his fault in the first place.

“He’s a hell of a quarterback and we’re excited that we got him,” Eagles coach Chip Kelly said Monday. “He obviously has a big-time arm, he’s got an NFL arm, he’s got NFL feet. He’s really, really smart, he’s sharp, great work ethic, very athletic. He had all the things we’re looking for in a quarterback.”

They’re so high on Sanchez in Philly, they’re even exonerating him for his interceptions. One of Sanchez’s two picks Sunday deflected off the hands of Josh Huff and, according to one written account out of Philadelphia, “should have been a completion.’’

When was the last time you recall anyone cutting Sanchez some slack for one of the many picks he threw as a Jet?

“I didn’t even know Foles was out,” Eagles tackle Jason Peters said about the first pass Sanchez threw after replacing Foles — a 52-yard completion to Jeremy Maclin. “[I saw] the bomb to Maclin and I turned to congratulate him and it was Sanchez.”

The word coming out of the Eagles’ locker room has been about how the offense doesn’t “miss a beat’’ with Sanchez at quarterback in place of Foles, who threw 27 touchdowns and only two interceptions with a 119.2 rating in 2013.

So there were the Eagles on Sunday, having fun in the face of adversity, while the Jets were matching their franchise-high losing streak at eight and wondering what to do about their woeful quarterback situation.

“I’m proud of Mark and happy for him,’’ coach Rex Ryan said Monday.

Then, the obvious question that Ryan could not answer truthfully in public even if he wanted to: “Is there any part of you that wishes you kept him?’’

“Mark was great, there’s no question about it and I wish him the best, but our decision, every decision we made, was what we think is in the best interest of our team,’’ Ryan said, dancing a verbal jig. “But I’m happy for him and I hope it works out well for him.’’

It’s already working out better for Sanchez than it is for the Jets, a trend that will likely continue considering that Sanchez is actually surrounded with skill position talent for the first time since he helped lead the Jets to those consecutive AFC Championship games in 2009 and 2010.

Sanchez supporters and haters can argue until they’re green with illness or envy about whether the Jets would be better off now with Sanchez, whether he was better than Geno Smith ever will be and whether Michael Vick, whom the Jets signed to replace him in the offseason, is better or worse.